Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
  • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
  • B07B1/06—Cone or disc shaped screens
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
  • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
  • B07B1/48—Stretching devices for screens
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
  • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B33/00—Hand tools not covered by any other group in this subclass

Definitions

• a mesh screen comprising at least one pair of cylindrical members each open at an end and a piece of mesh material clamped between the members, characterised in that the inner face of one cylindrical member is provided with a circumferential groove and a circumferential flange projecting in the same direction as the mouth of the groove, and the inner face of the other cylindrical member is provided with a circumferential flange adapted to mate with the circumferential flange of the one cylindrical member with the mesh material interposed therebetween and the free edge of the circumferential flange of the other cylindrical member being accommodated within the groove.
• each mesh screen is usually constructed as an independent unit with an independent housing. Consequently, the screening or sieving operation is usually performed separately for each mesh screen containing appropriate sample of material. Such operations can tend to be time consuming when a large number of screening or sieving operations need to be performed independently of each other.
• a partition member for interconnecting and partitioning a plurality of mesh screens of the kind comprising at least one pair of cylindrical members each open at an end and . a piece of mesh material clamped between the members , said partition member comprising a further cylindrical member having an inner radially disposed partitioning wall and a pair of opposed axially extending circumferential flange portions, each of said flange portions having an outer axial end of complementary shape to the outer axial end of a cylindrical member of a mesh screen so as to form a spigot in socket connection therewith when said members are brought into mutual engagement, wherein said members may be interconnected to provide a unitary housing for the mesh screens.
• a composite screening unit comprising:-
• a plurality of mesh screens each having at least one pair of cylindrical members open at each end and a piece of mesh material clamped between the members; and a partition member comprising a further cylindrical member having an inner radially disposed partitioning wall and a pair of opposed axially extending circumferential flange portions;
• each of said flange portions has an outer axial end of complementary shape to the outer axial end of a cylindrical member of a mesh screen, so as to form a spigot in socket connection therewith when said members are brought into mutual engagement, whereby said members are interconnected to provide a unitary housing for the mesh screens.
• a tool for levering apart interconnected cylindrical members of the kinds hereinbefore described comprising an elongate lever having a handle portion and a pair of longitudinally spaced outwardly projecting spigots, wherein said spigots are intended to be located within external grooves of adjacent interconnected cylindrical members, such that a rotating force may be applied to the handle of the lever, effectively applying an outwardly diverging axial force to each cylindrical member so as to force them apart.
• Fig. 1 is a fragmentary sectional elevation showing a series of cylindrical members axially connected to clamp mesh material therebetween and terminated at opposite ends by end cover members to form a mesh screen as described in the first embodiment;
• Fig. 2 is a side view of the partition member
• Fig. 3 is a sectional view of Fig. 2, taken along a vertical section through the centre of the member;
• Fig. 4 is a perspective view of a composite screening unit comprising three mesh screens connected to each other by partition members;
• Fig. 5 is an exploded sectional side elevation showing the cylindrical members of the mesh screen, a partition member, and an end cover member disposed relatively of the other members for axial engagement so as to define a compartment of a mesh screen, as described in the second embodiment;
• Fig. 6 is a side view of the lever
• Fig. 7 is an exploded side elevation showing the cylindrical members of two mesh screens separated by a partition member to form adjacent compartments in a unitary housing;
• Fig. 8 is an exploded side elevation showing the cylindrical members of a series of stacked mesh screens within one compartment being adjoined to a mesh screen of another compartment by a partition member.
• the first embodiment is directed towards a mesh screen.
• the mesh screen comprises an assembly of cylindrical members 11, 12, 13 and 14 clamped together, with mesh material A and B clamped between members 11 and 12 and members 13 and 14 respectively.
• the cylindrical members have an axial length which is small in relation to their diameter and each is provided with an external groove 15, 16, 17 and 18.
• the outer face of the members 11 and 13 are each provided with a downwardly projecting flange 19 and 20 respectively whilst the members 12 and 14 are provided with upwardly projecting flanges 21 and 22.
• the upper edges of the flanges 21 and 22 are tapered outwardly and are so shaped to fit into grooves 23 and 24 respectively provided on the inner face of the members 11 and 13.
• a number of clamps are provided on the external face of the assembly to prevent the cylindrical members coming apart.
• a top end cover member 25 provided with a downwardly projecting skirt 26 may be fitted to the upper end of member 11.
• a bottom end cover member 27 provided with an upwardly projecting skirt 28 may be fitted to the lower end of member 14.
• a lever 61 is provided with two spaced outwardly projecting spigots 63a and 63b, which are adapted to fit into the grooves 15, 16, 17 and 18. The lever is rotated about one of the spigots to apply force axially to separate the cylindrical members axially.
• the second embodiment is directed towards a composite screening unit comprising a series of mesh screens.
• the composite screening unit 31 comprises a series of mesh screens 32 which are interconnected by partition members 33 and terminated at opposite ends by a lid cover member 34 and a base cover member 35, respectively, the latter being formed by an end partition member.
• the mesh screens 32 essentially comprise a pair of cylindrical members 32a, 32b and a piece of mesh material clamped between the members (not shown) .
• the cylindrical members have an axial length which is small in relation to their diameter and each is provided with an external circumferential groove 36.
• the outer face of the upper cylindrical member 32a is provided with a downwardly projecting flange 37, whilst the lower member 32b is provided with an upwardly projecting flange 37b, the flanges projecting in the opposite axial directions of the members.
• the outer edges of the flanges 37 are each tapered outwardly and when brought into mutual engagement with each other, are intended to receive the mesh material therebetween.
• the upper edge of the flange 37b is particularly shaped to fit into an inner groove 38 provided on the inner face of the member 32a and thus enable the mesh material to be clampingly engaged therebetween.
• the upper cylindrical member 32a is formed with an axial end 39 opposite its lower flange 37a to define a spigot portion.
• An outwardly projecting rib 40 is provided between the external groove 36 and the spigot portion 39 to enable a socket portion of another cylindrical member to be connected to the spigot portion thereby forming a spigot in socket connection.
• the lower cylindrical member 34b is formed with its lower axial end 41 opposite the upwardly projecting flange 37b to define a socket portion.
• the lower end 41 is provided with an inner step 42 to enable a spigot portion of a cylindrical member to be accommodated within the socket end in a spigot in socket connection.
• the partition member 33 shown in detail at Figures 2 and 3 of the drawings and in cross section at Fig. 5, essentially ' comprises a further cylindrical member having an inner radially disposed partition wall 43 and a pair of opposed axially extending circumferential flange portions 44.
• the outer face of the partitioning member is formed with an external circumferential groove 45 intermediate the flange portion '44.
• the upper flange portion 44a projects axially a distance substantially further than that of the lower flange portion 44b relative to the location of the partitioning wall 43.
• Each of the flange portions have an outer end of complementary shape to the outer axial end of one or the other of the cylindrical members 32 of the mesh screen.
• the upper flange portion 44a has its outer axial end 46 formed with a spigot portion and a radially projecting rib 47 spaced from the distal end thereof which is adapted to be axially accommodated within the socket portion 41 of the lower cylindrical member 32b of the mesh screen, as shown at F g. 5 of the drawings.
• the lower flange portion 44b of the partition member has its outer axial end 48 formed with a socket portion and a step 49 spaced from the distal end thereof which is adapted to axially accommodate the spigot portion 39 of the upper cylindrical member 32a of an adjacent mesh screen (not shown in Fig. 5) .
• the end cover members 34 and 35 are each provided with an external groove 50 along their outer face and further comprise an end wall 51 and an axially projecting flange portion 53.
• the end wall 51 provides an end cover to the top mesh screen and, as shown at Fig. 5 of the drawings, the flange portion 53 projects downwardly and has its outer end 55 formed with a socket portion and inner step 57 so _as to axially accommodate the spigot end 39 of the upper cylindrical member 32a.
• the base cover member 35 has the outer end of its flange portion provided with a spigot end 58 and outer rib 60 to be axially accommodated with the socket end of a lower cylindrical -- member 32b of a mesh screen so that the end wall 51 thereof may form the base of the bottom mesh screen.
• the base cover member 35 in the present embodiment is in fact formed by a partition member, where the upper flange portion 44a defines the flange portion 53 of the base cover member, the partitioning wall 43 defines the end 51, and the radially projecting rib 47 defines the outer rib 60.
• the axial extent of the lower flange portion 44b is much less than that of the upper flange portion 44a of the end partition member to provide stability to the member when connected as a base cover member by lowering the centre of gravity of the stacked members as a whole.
• each of tV- mesh s r ens are assembled respectively by positioning pieces of nylon mesh material of the required mesh size over the tapered upper edges of the flanges 37b of each mesh screen with the outer portion of the mesh material positioned between the opposing flanges 37a and 37b of complementary cylindrical members 32.
• the dimensions of the flanges and members are such that the mesh is clamped firmly between the respected flanges.
• the cylindrical members may be pushed firmly together in an axial direction so that the tapered upper edges of the flanges 37b may be firmly accommodated within the complementary grooves 38 of the upper members, applying tension to the clamped mesh material.
• the upwardly projecting flange 37b of the lower cylindrical member is provided with a series of circumferential lacking collars 59 about its outer face to facilitate locking with the downwardly projecting flange 37a of the upper cylindrical member and also clamping of the mesh material .
• a partitioning member 33 may be axially connected to the socket end of a lower cylindrical member 32b of a particular screen so as to define the base for the compartment thereof, or alternatively to the spigot end 39 of an upper cylindrical member to define the top end of another screen.
• a series of mesh screens may be constructed having a unitary housing, but which have their compartments separated from each other by means of the partition member.
• the top screen may have a lid cover member 34 axially fitted to the upper cylindrical member thereof and a base cover member 35 axially fitted to the lower cylindrical member of the bottom mesh screen, completing the construction of the composite screening unit.
• the unit as a whole may be placed within a vibrating machine to effect mechanical screening or sieving of the contents within the mesh screens or may be used in a manual screening or sieving operation. Consequently, the screening or sieving operation may be simultaneously performed for each of the mesh screens with in the unit, wherein the screening or sieving performed in one compartment of a mesh screen is effected independently of an adjacent compartment by virtue of the provision of the partition member.
• a number of clamps may be provided on the external face of the assembly to prevent the cylindrical members from coming apart.
• a tool in the form of the elongate lever 61 shown at Fig. 6 of the drawings is provided with a handle portion 63 at one end and two spaced outwardly projecting spigots 63a and 63b which are particularly adapted to fit into the external circumferential grooves of adjacent cylindrical members so as to lever them apart when desired.
• the lever 61 may be rotated about one of the spigots located in an adjacent groove by applying a rotating force to the handle, so as to apply an outwardly diverging axial force to each cylindrical member, forcing them apart.
• An important aspect of the present embodiments is that much flexibility is provided by adopting the screen construction herein described in enabling a variety of different mesh material to be utilised by the same apparatus . This arises due to the relatively simple process of interconnecting or separating apart co ⁇ operating cylindrical members of a mesh screen, whereby mesh material of appropriate size can simply be inserted between the opposing flanges or removed therefrom to be replaced by another piece of material.
• a screen assembly can enable screening or sieving operations to be performed on a range of mesh material varying in size from 0.2 microns to 1700 microns.
• an important advantage of the present embodiments is the speed in which a screening or sieving operation may be performed due to the ability to assemble a large number of mesh screens in the one composite unit. Examples of different combinations of cylindrical members to form composite mesh screen units are shown at Figures 7 and 8.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Combined Means For Separation Of Solids (AREA)

Applications Claiming Priority (4)

Publications (2)

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ID=25643134

Family Applications (1)

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• 1987
  • 1987-07-24 IN IN236/BOM/87A patent/IN166204B/en unknown
  • 1987-07-24 US US07/302,592 patent/US5368169A/en not_active Expired - Fee Related
  • 1987-07-24 WO PCT/AU1987/000234 patent/WO1988000500A1/en not_active Application Discontinuation
  • 1987-07-24 BR BR8707758A patent/BR8707758A/pt unknown
  • 1987-07-24 EP EP19870904818 patent/EP0316328A4/en not_active Withdrawn
  • 1987-07-24 JP JP62504517A patent/JPH02500494A/ja active Pending

Non-Patent Citations (1)

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